A star atlas and telescopic handbook (epoch 1920) for students and amateurs, covering the whole star sphere, and showing over 7000 stars, nebulæ, and clusters; with short descriptive lists of objects suitable for small telescopes; (1910)
Norton, Arthur P. (Arthur Philip) · London, Edinburgh, Gall and Inglis · leaf 42
ars was 2nd mag. In 1837 it returned to 1st mag., faded slightly, and then in 1843 becaine almost asbright as Sirius. In 1862 it became invisible to the naked eye. It was 7th mag. in 1892 and 7^ mag. in1902. NEBULA <§: STAR CLUSTERS. M. 51 Canum Venaticorum, 13h. 26m. N. 47° 35. A spiral nebula;…
Stars
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